A clever general, therefore, avoids an army when its spirit is keen, but attacks it when it is sluggish and inclined to return. This is the art of studying moods.
Like the sun and moon, they end but to begin anew; like the four seasons, they pass away to return once more.
When your army has crossed the border, you should burn your boats and bridges, in order to make it clear to everybody that you have no hankering after home.
The general who advances without coveting fame and retreats without fearing disgrace, whose only thought is to protect his country and do good service for his sovereign, is the jewel of the kingdom.
Opportunities multiply as they are seized.
When the outlook is bright, bring it before their eyes; but tell them nothing when the situation is gloomy.